139412191 has 4 divisors (see below), whose sum is σ = 139464072. Its totient is φ = 139360312.

The previous prime is 139412179. The next prime is 139412197. The reversal of 139412191 is 191214931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191214931 = 61 ⋅3134671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139412191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139412197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21676 + ... + 27361.

It is an arithmetic number, because the mean of its divisors is an integer number (34866018).

Almost surely, 2^139412191 is an apocalyptic number.

139412191 is a deficient number, since it is larger than the sum of its proper divisors (51881).

139412191 is an equidigital number, since it uses as much as digits as its factorization.

139412191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51880.

The product of its digits is 1944, while the sum is 31.

The square root of 139412191 is about 11807.2939744888. The cubic root of 139412191 is about 518.5216776989.

The spelling of 139412191 in words is "one hundred thirty-nine million, four hundred twelve thousand, one hundred ninety-one".